a shaggy-dog story

a shaggy-dog story

a long, rambling story or joke, especially one that is amusing only because it is absurdly inconsequential or pointless.
The expression, dating back to the 1940s, comes from the subject of one such anecdote, a dog with shaggy hair.
1993 New York Times Book Review The book has the unhurried pace of the best of the shaggy dog stories; the pleasure is all in the journey rather than the destination.
See also: story

a ˌshaggy-ˈdog story

(informal) a long, complicated story or joke, which has no proper ending and is not very funny: He told us this joke, which turned out to be a shaggy-dog story, and I hate those!This expression comes from the subject of one particular story of this kind, a dog with long, untidy (shaggy) hair.
See also: story